class_docstr: Data structure holding a single PPI graph.
code: def __init__(
      self,
      adjacency_lists: List[np.ndarray],
      node_features: np.ndarray,
      node_labels: np.ndarray,
  ):
      self._adjacency_lists = adjacency_lists
      self._node_features = node_features
      self._node_labels = node_labels
  
file_path: ptgnn/ptgnn/implementations/ppi/dataloader.py
imports: import numpy
  from dpu_utils.utils import RichPath
  from typing import Dict, List
label_desc: Use image node_id 1 to create a new PPIGraphSample object  with example: obj = PPIGraphSample(adjacency_lists, node_features, node_labels)